Type-writing machine



L. S. BURRIDGE, DECD.

F. 0. surnames, EXECUTOR.

TYPE WRITING MACHINE.

APPLICATION FILED NOV. 10. l9l7.

Patented-Sept. 50, 1918.

3 SHEETSSHEET I W ir Affo 6y LEEKQESQM L. S. BURRIDGE, DECD.

F- 0. BURRiDGE. EXECUTOR.

TYPE WRITING MACHiNE.

APPLICATION HLED NOV-10.1917.

1,3 1 7A@2B Patented Sept. 30, 1919.

3 SHEET$-SHEET 2.

MknesSes: i 0 m9 4w @W ZZZQ L. S. BURMDGE, DECD.

r. 0. BURRIDGE. EXECUTOR.

TYPE WRITING MACHINE.

APPLlCATlON FILED NOV. 10. 1917.

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UTED STS '1 TNT LEE S. BURRIDGE, DECEASED LATE OF NEW YORK, N. Y., BYFRANCIS O. BURRIDGE,

. EXECUTOR, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TOUNDER- WOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OFDELAWARE.

TYPE-WRITING MACHINE.

Original application filed September To all whom it may concern Be itknown that LEE S. BUnRmeE, deceased, late a citizen of the UnitedStates, and late residing in the borough of Manhattan, county, city, andState of New York, invented certain new and useful Improvements inType-Writing Machines, of which the following-is a specification.

This invention relates to carriage-controlling mechanism for typewritingmachines.

This application is 'adivision of pending app5lication No. 52,594, filedSeptember 27, 191

An object of this invention is to provide a simple and eflicient'escapement mechanism which maybe economically manufactured and easilyassembled.

In the type of machine illustrated, the platen carriage is mounted upona frame which is shiftable up and down to various positions forpermitting the printing of different case types. This shiftable framecomprises front and back sheet-metal plates. The escapement wheel ismounted between these front and rear plates. The loose dog and the fixeddog of the escapement mechanism are carried by a rocking plate which isjournaled between said front and rear plates. This dog rocker may bemade of sheet-metal, and supported upon a sheetmetal bracket secured toone of the transverse plates of the shifting frame. A universal barlocatedbeneath the keys of the machine is provided with a connection tothe dog rocker. The dog rocker is provided with a slot, the sides ofwhich are engaged by the connections from the universal bar. This slotis elongated so that the dog rocker will always be under the control ofthe universal bar in all case-positions of the shift- ,ing frame uponwhich the dog rocker is mounted.

The dog rocker is'mounted upon a vertical axis for-a horizontalmovement, and the shifting frame is -mounted for a substantiallyvertical movement, and a slot in the dog rocker is vertically disposedso that the leverage between the dog rocker and the connections from theuniversal bar remain constant, irrespective of thediiferent verticalpositions occupied by the do rocker.

The loose dog, in the present invention,

Specification of Letters fatent. Patented Sept. 30, 1919.

27, 1915, Serial No. 52,594. Divided and. this application filedNovember 10, 1917. Serial No. 201,260.

a position in which it will be engaged by.

the next succeeding tooth when returned to the escapement wheel. Forlimiting the loose dog in this movement the present in vention providesa spring instead of a fixed stop, as has heretofore been done. With thisarrangement when the carriage is moved in anti-letter-feed direction,and the escapement wheel which is connected thereto by the pinion andrack is rotated, the limiting spring will yield and permit the teeth ofthe escapement wheel to cam said dog to abnormal position to permit theteeth to pass the dog. This obviates the necessity of providing aone-way connection between the escapement wheel and the carriage inorder to permit the carriage to be returned or set back.

To aid in assembling the parts and to perso as to be readily removed.For this pur- 7 pose the escapement wheel is mounted on a rod or shaft,bearing in the front, and rear shift frame plates, which may be entirelywithdrawn from its supports. drawal of the shaft permits the removal ofthe escapement wheel. The shaft is posi- This withtively held in themachine against turning and withdrawal by means of an arm, secured tothe shaft, which may be held to the frame by means of a screw. Thecarriage rack is journaled on trunnions, one of which extends into asocket in the carriage frame, and the other of which extends into asocket in a bracket which is removablyheld to the carriage frame by apair of screws.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a side elevation, showing the shiftable platen frame.

Fig. 2 is a rear el vation, showing part of the springdrum mechanism.

Fig. 3 is a detail 'sectional view of the carriage spring mechanism.

Fig. 4 is a rear sectional view, showing part of the escape' nentmechanism.

Fig. 5 is a sectional elevation, showing the mounting of the escapementwheel.

Fig. 6 is a side elevation, showing the connections from the keys of themachine to the escapement mechanism.

Fig. 7 is a sectional top-plan view, showingjhe parts shown in Fig. 4.

- *ig. 8 is a front elevation, showing the carriage rack and escapementmechanism.

Type-bars 10 are swung upwardly and rearwardly against the front face Iof a platen 11 at the depression of keys 12 mounted on key levers 13.The platen 11 is mounted on an axle 14 rotatably mounted in side plates15 forming part of a type Writer carriage 16; said typewriter carriagealso comprising bars 17 serving as rails for ball-bearings 18, uponwhich the carriage rides in letter-feed and return directions.

The hall-bearings are confined between the rails 17 and forward andrearward plates 19 and 20 which form part of a frame 21. The frame 21,which also,comprises side plates 22, is suitably guided and shiftablesubstantially vertically, for the purpose of moving the platen tovarious case-printing positions.

The typewriter carriage normally tends to move in letter-feed directionunder the influence of a spring 23 connected by a cord or tape 24 to thecarriage 16.

The letter-feed movement of the type writer carriage is controlled by anescape ment mechanism, which comprises an escape: ment wheel 25 and alsoa pinion 26 engaging a rack 27 carried by the typcwrlter carriage.

- The escapement'wheel 25, formed with a hub 28 to which the pinion. 26is secured, is

mounted to rotate on a pin 29 which passes.

through the-hub 28, and which is mounted in the forward: and rearwardplates 19 and 20. The pin 29 is, mounted atone end in a bushing 30secured to the front plate 19, which is of sheet-metal, and at its otherend in a bushing 31 secured to the rear plate 20, which is also'ofsheet-metal. The bushi 31 extends from the rear plate 20 iforwar and,acts as a spacer for holdihg the es capement wheel against lateralmovement on the pin 29; the escapement wheel being confined betweenthe-bushing 31 and the bush-.

ing 30. So that the parts may be conveniently assembled and removed fromthe machine, the pin 29 is removably held in the machine by a plate 32riveted to one end of the pin 29. The plate 32 is secured to the rearplate 20 by means of a screw 33.

The escapement wheel 25 is normally prevented from rotating under theinfluence of the carriage spring 23, by an escapement dog 34 whichengages with one of the teeth 35 of the escapement wheel. The dog 34- ispivotally mounted at 36 upon a plate 37, and is limited in its movementin one direction by means of a stop-pin 38 secured to the plate 37. Thecarriage spring 23 through the rack 27 and the pinion 26 normally tendsto rotate the escapement wheel, and, therefore, the escapement dog 34 1snormally held against the stop-pin 38. The

plate '37, which is preferably stamped from sheet-metal, is mounted fora horizontal rocking movement on trunnions 39 riveted to cars 40,formed. integral with the Plate 37, and having headedends extendingthrough ears 41 on a bracket 42 secured to the rear plate 20.

When the rocker plate 37 is moved by mechanism hereinafter described,the loose dog 34 is moved out of engagement with the tooth 35 on theescapement wheel, and a fixed dog 43 formed integral withthe plate 37 ismoved into engagement: with the escapement wheel, to hold the sametemporarily against movements Thus freed from the escapement wheel theloose dog 34 is movedup by a draw-spring 44,.connected to an arm 45extending from said dog, into the position shown in Fig. 4, indot-anddash lines. In this position the dog 34 is located opposite thenext tooth on the escapement wheel, so that when the rocker plate isreturned to normal position by its spring 46, (see Figs. 6 and 7), andthe fixed dog 43 is moved out of engagement with the esoapement wheel,the loose dog will be moved intgposition to engage the said next toothon the escapement wheel.-

out of reach of,the escapement wheel, by a the carriage to also be fixedstop, but in the present invention said dog is limited by a draw-spring47. This spring47, with the spring 42, normally tend to move the dog tothe dot-anddash line position, shown in Fig. 4, and no farther. Theomission of \the customary stop is advantageous 'in that the noiseaccompanying the operation of the machine is reduced. Spring 47 returnsthe dog to the midway (dot and-dashyposition after said dog has beenvibrated upwardly beyond the dot-anddash position by the' reverselymoving escapement wheel 'asthe carriage is drawn back. Springs 44 and 47diverge from the s rin 47 b Y the escapement wheel to an abnormalposition, until the teeth of the es capement wheel may pass the dog. Ifthe loose dog 34 was limited in. its upward movement, to its position toengage the next tooth of the escapement wheel, after said Wheel isreleased by the fixed dog, then said fixed stop would operate to preventthe backward rotation of the escapement wheel, and thereforetheanti-letter-feed of the platen.

The present invention, therefore, simplifies and reduces the cost of thedevice by obviating the necessity of providing a one-way connectionbetween the escapement wheel and the carriage, which has heretofore beenthe practice, in order to permit the carriage to be moved .inanti-letter-feed direction.

The mechanism for operating the rocker plate 37 from the keyboard of themachine to cause the letter-feed movements of the carriage will now bedescribed.

A universal bar 49, extending across the machine and located directlybeneath the key levers 13, is pivoted at its, rear end in brackets 50which, in turn, are secured to a transverse bar 51 of the. main, frame.Each of-thetkey levers 13 has a shoulder 52, adapted, when the key leveris depressed-to strike and depress the universal bar. The

universal bar is connected to rock the dog plate 37 by means of a rockshaft 53, Which has arms 55'connected by links 56 to the universal bar49. The rock shaft 53 is journailed in brackets 54 which are secured tothe bar 51: A link 56 in an arm 55 is provided for each side of theuniversal bar. The rock shaft 53, the arms 55 and the links 56 connectthe opposite sides of the universal bar, and therefore cause saiduniversal bar to descend uniformly whether operated by a key at one sideof the machine or the other. The rock shaft 53 has an arm 57 securedthereto, which at its upper end is connected to a draw bar or link 58.The draw bar'-58 is connected at its forward position to the arm 57 by apin 59 secured ;to the draw bar, and at its rearward portion to asupporting lever 60. Secured to the rearward portion of the draw bar 58,which is preferably of sheet-metal, is a threaded post or pin 61. whichextends through an opening 62 in the end 63 ofthe rocker plate 37, and"has a head or nut 64 thereon which engages with the sides of theopening 62. The nut 64 is adjustably"*he1d The connection 61, 64 isuniversal against lDOVGll'lBlli] on the threaded pin 61 by means of alock nut 65.

The opening 62 is elongated so that the rocker may rise with the shiftframe to the various case-positions, without permitting the pin 61 andnut 64 of the draw bar to become disengaged from the dog rocker;therefore, the universal bar may operate the dog rocker in allcase-positions of the shift frame. The slot 62 is arranged to substantially parallel the axis about which the dog rocker pivots. In thepresent case the dog rocker axis is vertically disposed, and, therefore,the slot 62 is vertically disposed. This arrangement permits theshifting of the dog rocker with respect to the draw bar without varyingthe leverage or altering the amount of movement which the dog rockerwill re ceive from the universal bar. The portion 63 of the dog rockeris tilted slightly, so as to parallel the'path of movement of theshiftframe to further aid in maintaining the connections between theuniversal bar and the dog rocker constant. The. slot 62 has an open end62 so as to permit the device to be easily assembled. Said axis of thedog-rocker pivot extends about in the direction of case-shiftingmovement of the platen, whereby the key connection is able to have thesame control of the rocker in all case-shift positions.

Vhen a key lever 13 is depressed by its key 12, theslioulder 52 on saidkey lever operates the universal bar 49. and in doing so, rocks theshaft 53 through the links 56 and the arms 55, to move 'the draw bar-'58forwardly so that said draw bar 58 will rock the dog plate 37 to movethe loose dog 34 out of engagement with the escapement wheel. As the keyrises under the influence of its spring 66, the dog rocker 37 throughits spring 46, returns the draw bar 58 and the lever 60, on which it isiioatedly mounted, to normal position; at the same time as the loose dog34 is being moved into codraw bar and the lever, on which the draw baris mounted, are limited in this return movement by a stop 67 (see Fig.7), formed on on arm 68 secured to the rear plate 20 keys. In order thatthe rock shaft 53, which is operated by the universal bar, may performother functions before the escapement mechanism is operated. and inorder that the escapement mechanism may be operated only at the end ofthe keystroke, the draw bar 58 is slotted at 6-9, so that the pin 59 inthe arm 57 may have a limited lost-motion beat the other ,end to thearm' 57, holds said arm and thereforethe universal bar 49 in jforeoperating said draw bar. A spring 70, secured at one end to the draw bar,58 and normal position. The spring 70 is weaker than the spring 4-6,which holds the dog rocker 37 and the draw bar 58 in normal position.Therefore, in the first part of the movement of the arm 57, as the keyis depressed, the spring 7 0 yields and the draw bar is not moved untilthe pin 59 on said arm 57 reaches the end of the slot69 in the draw bar.4

So that the universal bar will cause the feed of the platen in allcase-positions of the latter, the opening 62 in the dog rocker 37,

through which the draw bar 58 passes, is elongated so that the draw bar,which is mounted in the main frame, will always remain in operativeengagement with the dog rocker 37, which is mounted in the main frame21, which, in turn, has a substantially vertical. shifting movementrelative to the main frame.

A space-key '71 is carried. by a lever 79. fast on a rock shaft 73 towhich is also fastened an arm 74; which is connected by a link 7 5 tooperate the lever 60, on which the draw bar .58 is floa tedly mounted.The space-key and associated parts are held in normal position by aspring 75 connected to the arm 7% and at the other end tothe frame ofthe machine. When the space-key 71 is depressed, the arm 74 and the link75 are moved forward. This moves the draw bar forward, so that the nut-64, carried by said draw bar, engages with the portion 63 of the dogrocker and operates the esca'pement mechanism. 550 thatthe space-keywhich is connected to the draw bar will not be operated when the drawbar is operated through the universal bar 49, the

lever 60 is slotted at Ti .1 This slot permits the lever 60b!) be movedforward without when the operator desiresto move the typeoperating thelink 7 5, but permits the link 75, when moved forward, to operate thelever."

lhe carriage rack 2? is pivotally mounted on the typewriter carriage,and has secured thereto a handle or linger-piece 79, so that writercarriage in letter-teeddirection without interference from theesceqiement mechanism, the carriage rack may bereleased from theescapement wheel by operating said finger-piece to move the rack 27 outof engagement with the pinion 26 secured to the escapement wheel.Thefingenpiece '(9 is located in a place Where it is convenient to theoperator. The rack 27 is limited in its swinging movement in onedirection by means of a stop riveted to the rear carriage rail l Inorder to facilitate. the assembling and:

extends into a hole 8% in a bracket secured to the other side plate 15by screws 86.

With this arrangement the rack may be attached to the carriage after theside plates 15 and the rails 17 have been riveted together. In attachingthe device the trunnion 81 is first slipped in the opening 82, then thebracket 85 is slipped on the trunnion 83, and then the bracket 85' issecured. 1

to the side plate 15 by the screws 86. If it is desired at'any time toremove the rack 27 "for the purposeof repair, or for substituting a rackof different pitch, the screws Bliare withdrawn, after which-the rackmay be readily slipped out of its bearing in the side plate 1.). It willbe sure that the escapement wheel 25 and the pinion 26 may also bereadily removed from the machine for. the purpose of maklngrepairs orsubstituting a pinion and esrapement wheel of dif ferent pitch. Toremove the escape ment wheel and pinion, it is only necessary towithdraw the screw 33 and then pull the in 29 with its plate 32 out ofits supports. T is would permit the escapmnent wheel to be slipped outof its position in the frame.

Theremovable rack and removable es capement wheel and pinion make itextremely convenlent to change the ,maclnne' from'e one sizeletterspacing to another; and it will be seen that thi chan e may beaccomplished without dis-assem ling the machine to any great extent.

Variations may be resorted to within the scope of the invention, andportions of the 1m .aving thus described the invention, What is claimedis: i

1. In a typewriting machine, the combination with a platen, of means fordriving the capement mechanism for controlling the driving of the platencomprising a toothed wheel a pair of dogs for holding said wheel, arocker plate for jsupportin said dogs, means for vibrating sald roe orplate to rovements may be used without others.

platen in letter-feed direction, and an esmove said dogs into and out ofthe plane of the wheel, and two draw-springs attached to an arm providedupon one of said dogs,

one for rocking, the dog toward a succeeding tooth on the wheel, when ithas been disengaged from one tooth of the wheel by movement of therocker-plate, and the other spring for returning the dog after it has.

been dis laced by the reverse rotation of the whee said springsdiverging from said dog arm inn manner that the operation of said'dogmay render either spring efi'ective and the other simultaneouslyin'efiective.

2. In a typewriting machine, the combination with a platen, of acarriage for said platen, a frame for said carriage comprising I frontand rear sheet-metal plates, an escapement wheel mounted between saidfront and rear plates, and a rod on which said escape said rockerextending about in the direction of the case-shifting movement of theplaten.

ment Wheel is mounted, said rod being mounted in bosses secured to saidplates.

3. In a typewriting machine, the combination with a platen, of acarriage for said platen, a frame for said carriage comprising front andrear sheet-metal plates, an escapementwheel mounted between said frontand rear plates, and a rod on which said escapement wheel is mounted,said rod being removably mounted in bosses secured to said plates, saidrod being held in po sition in the plates by an arm to which it issecured, and said arm being removably secured to one of said plates.

4. In a typewriting machine, a main frame, a platen frame shiftabl'ebetween case-positions on the main frame, a platen mounted forletter-feed movement on the platen frame, means for driving the platenin letter-feed direction, an escapement mechanism in the platen framefor controlling the letter-feed drive of the platen, type keys on themainframe, and a universal connection from said keys to the escapementmechanism for operating the latter; said escapement mechanism comprisinga toothed wheel, a dog adapted to be rocked into and out of engagementwith said wheel, and a carrier for said dog having therein a slotthrough which the carrier is engaged'and rocked by the connection fromthe type keys, said slot permitting shift of the carrier with the platenframe without shift of the typekey connection.

5. In a typewriting machine, a main frame, a platen frame shiftablebetween casepositions on the main frame, a. platen mounted forlettei-feed movement on the platen.

frame, means for drivihg the platen in letter-feed direction, anescapement mechanism on the platen frame for controlling the letter-feeddrive of the platen, type keys on the main frame, and connections fromsaid keys to the escapement mechanism for operating the latter; saidescapement mechanism comprising a slotted rocker with which the type-keyconnection is in slidable engagement, so that the rocker 1 may beshifted with the platen without shift of said key connection, the axisof rocking movement of 6. In a typewriting machine, a main frame, aplaten frame shiftable between case-positions on the main frame, aplaten mounted for letter-feed mzn ement on the platen frame, means fordIlVlIlgWht-i platen in letter-feed direction, an escapement mechanismon the platen frame for controlling the letter-feed drive of the platen,a spacekey on the main frame, and connections from said key to theescapement mechanism for operating the latter; said escapcment mechanismcomprising a toothed wheel, a dog adapted to be rocked into and out ofengagement with said wheel, and a carrier for said dog having therein aslot through which the carrier is engaged and rocked by the connectionfrom the space-key, said slot permitting shift of the carrier with theplaten frame without shift of the key connection.

7. In a typewriting machine, a main frame, a platen frame shiftablebetween case-positions on the main frame, a platen mounted forletter-feed movement on the platen frame, means on the platen frame ftirdriving the platen in letter-feed direction, type keys, and mechanismactuated thereby for controlling the letter-feed drive of the platen,said key-actuated mechanism comprising a universal bar on the mainframe,

an arm connected to the bar to be rockedthereby, a link vibrated by saidarm, and a rocker on the platen frame vibrated by said link, said rockerhaving a vertical slot engaged by said link to accommodate the Icase-shift movements of the rocker, and the axis of rocking movement ofthe latter extending about in the direction of the caseshift movement.

8. In a typewriting machine, a main frame, a platen frame shiftablubetween case-positions on the main frame, a platen mounted forletter-feed movement on the platen frame, means on the platen frame forfor controlling the letter-feed drivejof the platen, said key-actuatedmechanism comprising a universal bar on the main frame, a rod on themain frame extending forward and rearward thereon, a connection from theuniversal bar to the rod for reciprocating the same, and a rocker on theplaten frame having a vertical slot engaged by the rod, to enable therod to actuate the rocker at all case-shift positions of the rocker.

9. In a typewriting machine, a main frame, a platen frame shiftablebetween case-positions on the main frame, a platen, means for drivingthe platen in letter-feed direction on the platen frame, and anescapement for controlling the drive of the platen, comprising a toothedwheel, a dog;

for driving the platen in letter-feed direction on the platen frame, andan escapement for controlling the drum of the platen, comprising atoothed wheel, .a dog-carrying rocker shiftable with said platen frame,and

an actuator for the rocker in engagement therewith, said rocker having avertical slot engaging said actuator to permit shift of the platen frameWith respect to the actuator, and the axis of rocking movement of therocker extending about in the direction of its case-shift movement; saidrocker having the part thereof engaged by the actuator inclined in thedirection of shift of the platen frame, so that the movement of therocker and actuator may be the same in all casepositions of the platenframe.

11. In a typewriting machine, a main frame, a platen ;-frame shiftablebetween case positions on'the main frame, a platen mounted forletter-feed movement on the platen frame, an escapement on the platenframe for controlling the letter-feed movement of the platen, type keys,a universal bar, a spaoe-koy,a connection for operating the escapementfrom the universal bar, a connection for operating the esoapement fromthe space-key independently of the operation of the universal bar, andmeans for shifting the platen frame Without breaking saidescapen'xent-opera-ting connections.

112. In a ty'pewriting machine, the combination with a platen, of acarriage therefor, a main frame, a carriage-supportingv frame shiftablevertically on the main frame to various case-positions, means for movingthe carriage in letter-feed direction, an es- (capement Wheel mounted inthe carriage supporting frame, dogs for holding said escapement Wheel, arocker on which said dogs are mounted, said rocker mounted on saidcarriage-supporting frame, keys mounted in said main frame, auniversalbar operated aeraeea by said keys also mounted in said mainframe, and eonneotions between said uni- 40 versal 'bar and said dogrocker, said dog rocker being mounted about a vertical axis forhorizontal movement and having a slot on one end through Which theconnections from the universal bar pass, sa d slot being verticallydisposed, whereby the dog rocker is controlled by the universal bar inall casepositions of the shift frame.

13. In a typewriting machine, a main frame, a platen frame shiftablebetween casepositions on the main frame, a platen mounted forletter-feed movement on the platen frame, means on the platen frame fordriving the platen in letter-feed direction, type keys, and mechanismactuated thereby for controlling the letter-feed drive of the FRANCIS O.BURRIDGE, Eaaecuzfor of the last will and testament of Lee S. Bzmedgc,deceased.

Witnesses FRANCIS G. SMYTH, Jn, F. GARLAND TUCKER.

